So back to the original issue... thats a lot of money for a battery and very small inverter. The price may actually be decent... but it's still a lot of money. You would still need solar panels. Then after getting solar panels, you will have very little usable energy. For about the same money you can get a 4000-5000 watt propane generator and 3 or 4 100 lbs propane tanks. That would be enough fuel to run your generator for at least a week, if not 2 weeks. The propane could be stored essentially forever.
I'm sure you can even rent a larger propane tank for relatively cheap. Propane can be delivered within a relatively short period after a storm, meaning that even if you only have 2 weeks reserve, you can survive longer due to delivery.
When you consider the cost of buying that suitcase and an array, I still think the propane is cheaper and gives you more benefit.